It is 24 ports at a full 15.4 watts. If you have devices that only require 10
watts of power, you can support 36 of them on a B2/B3 or C2/C3. The PoE
switches return any unused power back to the central pool so it can be
allocated to other ports. The PoE logic works as follows:
* Determine the PoE Class of the device
o Class 1 - up to 4.0 watts
o Class 2 - up to 7.0 watts
o Class 3 - up to 15.4 watts
* Confirm that PoE power pool has enough power for the maximum power
for the class
* Provide power to the port
* Monitor the actual power usage of the port (in my example, it is 10
watts)
* Return unused power (15.4 - 10.0 or 5.4 watts) to the pool for
allocation to other ports
So the 500 watt power supply provides 370 watts of PoE power that can power the
maximum number of ports based upon the following calculation:
Max # PoE Ports = ROUNDDOWN(1 + (370 watts - Device
Class Power)/Actual Power Consumption))
So for Class 3 devices that only draw 8 watts of PoE power, the calculation
would be;
Max # PoE Ports = ROUNDDOWN(1 + (370 watts - 15.4
watts)/8))
= ROUNDDOWN(1 +
(354.6)/8))
= ROUNDDOWN(1 +
44.32)
= 45
I hope this helps.
Karl F Pieper
Product Manager - Fixed Switching
Enterasys Networks
Office: 978-684-1445
Cell: 978-886-9868
Email: [email protected]<mailto:[email protected]>
From: Michael Blohm [mailto:[email protected]]
Sent: Friday, January 07, 2011 1:01 PM
To: Enterasys Customer Mailing List
Subject: Re: [enterasys] PoE behaviour on SecureStack
Is that 24 ports at 15.4w or is it 24 ports no matter the power requirement of
the device?
--
Michael Blohm
Network/ Telecommunications Engineer
Estate of William G. Helis/ Helis Oil & Gas Company L.L.C.
228 St. Charles Avenue
Suite 912
New Orleans, Louisiana 70130
504-952-6701 Cellular
504-523-1831 Office
713-851-5480 Houston Cellular
________________________________
From: "Kaiser, Markus" <[email protected]>
Reply-To: <[email protected]>
Date: Fri, 7 Jan 2011 11:55:24 -0600
To: Enterasys Customer Mailing List <[email protected]>
Cc: Enterasys Customer Mailing List <[email protected]>, "Benjamin
Maze (Europe)" <[email protected]>
Subject: Re: [enterasys] PoE behaviour on SecureStack
Hi,
B2/B3/C2/C3 switches are only able to serve a little bit more than 24 ports
with PoE, doesn't matter if 24 or 48 port switch. For PoE calculations, only
use the number 24 on any kind of the above switches.
Cheers,
Markus
Sent via iPhone.
On 07.01.2011, at 16:36, "Benjamin Maze (Europe)"
<[email protected]<mailto:benjamin.maze<[email protected]%3cmailto:benjamin.maze>@eu.didata.com>>
wrote:
Hello all and happy new year!
I have a question that I'm not able to resolve with documentation on Enterasys
website
I use a B3 48 POE ports
In datasheet, the switch can deliver only 370W
It's not enough if I connect 48 PD (PoE Device) (48*15,4 = 739W)
What is the behavior if I add a C2RPS-POE?
Can I use the power of the RPS in addition of the power of the switch if I need
more than 370W for my PD?
Thank you for your help
Regards,
Benjamin Maze
Presales Engineer
Dimension Data France
Tel. +33 1 49 75 86 26
Mob. +33 6 60 25 66 78
Fax. +33 1 49 75 86 49
[email protected]<mailto:bruno.lignon<[email protected]%3cmailto:bruno.lignon>@eu.didata.com>
DIMENSION DATA FRANCE, Zone Orlytech, 20 avenue Louis Bleriot, 91781 Wissous
Cedex
For more information about Dimension Data, please go to
<http://www.dimensiondata.com/fr> http://www.dimensiondata.com/fr
P Before printing, think about the environment
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